Salisbury by Honeywell’s Premium Lightweight 40 cal/cm2 Arc Flash protection garments have a total fabric weight of 370g/m2. This makes them the lightest 40Cal/cm2 Arc Flash items available in the industry.Premium Lightweight garments have a Heat Attenuation Factor of 93.20%, meaning the garment is not only flame resistant, but resists 93.2% of the heat experienced in an arc flash.